#1F3787#1F3787

#1F3787 is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.1% C 0.137 H 266.8°. Best body text is #FFFFFF at 10.74:1 contrast (WCAG AA passes).

Color values

HEX	#1F3787
RGB	rgb(31, 55, 135)
HSL	hsl(226, 63%, 33%)
HSV	hsv(226, 77%, 53%)
CMYK	cmyk(77%, 59.3%, 0%, 47.1%)
CIE-LAB	lab(26.08, 21.02, -47.43)
CIE-LCH	lch(26.08, 51.88, 293.90°)
OKLab	oklab(37.06% -0.0077 -0.1369)
OKLCH	oklch(37.06% 0.137 266.8)
XYZ	xyz(6.3029, 4.7723, 23.5059)
Luminance	0.0477 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3787 #876F1F

analogous

#1F6B87 #1F3787 #3B1F87

triadic

#1F3787 #871F37 #37871F

tetradic

#1F3787 #871F6B #876F1F #1F873B

square

#1F3787 #871F6B #876F1F #1F873B

split-complementary

#1F3787 #873B1F #6B871F

monochromatic

#080E23 #142355 #1F3787 #2A4BB9 #4B6BD6

Accessibility & contrast

On white

10.74

#1F3787 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#1F3787 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3787

10.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3787	#FFFFFF	#000000	##FFFFFF
##1F3787	1.00	10.74	1.95	10.74
#FFFFFF	10.74	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00438A

Deuteranopia (green-blind)

#003985

Tritanopia (blue-blind)

#004B59

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1f3787;
/* rgb */ color: rgb(31, 55, 135);
/* oklch */ color: oklch(37.1% 0.137 266.8);

Tailwind

colors: {
  custom: {
    50: '#6b6dab',
    500: '#1f3787',
    950: '#000000',
  },
}

SCSS

$custom: #1f3787;
$custom-light: #6b6dab;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3787",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 135
  },
  "hsl": {
    "h": 226.154,
    "s": 62.651,
    "l": 32.549
  },
  "oklch": {
    "l": 0.37057,
    "c": 0.1371,
    "h": 266.8
  },
  "luminance": 0.04773
}

Semantic roles & 50–950 ramp

primary

#1F3787

secondary

#B89F4A

accent

#C042E6

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1F3787

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →